netdev - Re: [PATCH net-next 06/10] dt-bindings: soc: mediatek: move ilm in a dedicated dts node

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Message-ID: <20230321193254.GA1306908-robh@kernel.org>
Date:   Tue, 21 Mar 2023 14:32:54 -0500
From:   Rob Herring <robh@...nel.org>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, matthias.bgg@...il.com,
        linux-mediatek@...ts.infradead.org, nbd@....name, john@...ozen.org,
        sean.wang@...iatek.com, Mark-MC.Lee@...iatek.com,
        lorenzo.bianconi@...hat.com, daniel@...rotopia.org,
        krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org
Subject: Re: [PATCH net-next 06/10] dt-bindings: soc: mediatek: move ilm in a
 dedicated dts node

On Mon, Mar 20, 2023 at 05:58:00PM +0100, Lorenzo Bianconi wrote:
> Since the cpuboot memory region is not part of the RAM SoC, move ilm in
> a deidicated syscon node.
> This patch helps to keep backward-compatibility with older version of
> uboot codebase where we have a limit of 8 reserved-memory dts child
> nodes.

Maybe, but breaks the ABI. It also looks like a step backwards. Fix your 
u-boot.

> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  .../arm/mediatek/mediatek,mt7622-wed.yaml     | 14 +++---
>  .../soc/mediatek/mediatek,mt7986-wo-ilm.yaml  | 45 +++++++++++++++++++
>  2 files changed, 53 insertions(+), 6 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/soc/mediatek/mediatek,mt7986-wo-ilm.yaml
> 
> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-wed.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-wed.yaml
> index 7f6638d43854..5d2397ec5891 100644
> --- a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-wed.yaml
> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-wed.yaml
> @@ -32,14 +32,12 @@ properties:
>    memory-region:
>      items:
>        - description: firmware EMI region
> -      - description: firmware ILM region
>        - description: firmware DLM region
>        - description: firmware CPU DATA region
>  
>    memory-region-names:
>      items:
>        - const: wo-emi
> -      - const: wo-ilm
>        - const: wo-dlm
>        - const: wo-data
>  
> @@ -51,6 +49,10 @@ properties:
>      $ref: /schemas/types.yaml#/definitions/phandle
>      description: mediatek wed-wo cpuboot controller interface.
>  
> +  mediatek,wo-ilm:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: mediatek wed-wo ilm interface.
> +
>  allOf:
>    - if:
>        properties:
> @@ -63,6 +65,7 @@ allOf:
>          memory-region: false
>          mediatek,wo-ccif: false
>          mediatek,wo-cpuboot: false
> +        mediatek,wo-ilm: false
>  
>  required:
>    - compatible
> @@ -97,11 +100,10 @@ examples:
>          reg = <0 0x15010000 0 0x1000>;
>          interrupts = <GIC_SPI 205 IRQ_TYPE_LEVEL_HIGH>;
>  
> -        memory-region = <&wo_emi>, <&wo_ilm>, <&wo_dlm>,
> -                        <&wo_data>;
> -        memory-region-names = "wo-emi", "wo-ilm", "wo-dlm",
> -                              "wo-data";
> +        memory-region = <&wo_emi>, <&wo_dlm>, &wo_data>;
> +        memory-region-names = "wo-emi", "wo-dlm", "wo-data";
>          mediatek,wo-ccif = <&wo_ccif0>;
>          mediatek,wo-cpuboot = <&wo_cpuboot>;
> +        mediatek,wo-ilm = <&wo_ilm>;
>        };
>      };
> diff --git a/Documentation/devicetree/bindings/soc/mediatek/mediatek,mt7986-wo-ilm.yaml b/Documentation/devicetree/bindings/soc/mediatek/mediatek,mt7986-wo-ilm.yaml
> new file mode 100644
> index 000000000000..2a3775cd941e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/mediatek/mediatek,mt7986-wo-ilm.yaml
> @@ -0,0 +1,45 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/mediatek/mediatek,mt7986-wo-ilm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek Wireless Ethernet Dispatch (WED) WO ILM firmware interface for MT7986

Either this region is some memory or it's a device. Sounds like the 
former and this is not a 'syscon'.

> +
> +maintainers:
> +  - Lorenzo Bianconi <lorenzo@...nel.org>
> +  - Felix Fietkau <nbd@....name>
> +
> +description:
> +  The MediaTek wo-ilm (Information Lifecycle Management) provides a configuration
> +  interface for WiFi critical data used by WED WO firmware. WED WO controller is
> +  used to perform offload rx packet processing (e.g. 802.11 aggregation packet
> +  reordering or rx header translation) on MT7986 soc.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - mediatek,mt7986-wo-ilm
> +      - const: syscon
> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    soc {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      syscon@...e0000 {
> +        compatible = "mediatek,mt7986-wo-ilm", "syscon";
> +        reg = <0 0x151e0000 0 0x8000>;
> +      };
> +    };
> -- 
> 2.39.2
>